Fuel heater



FIG. 1 is a perspective view of fuel heater showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a perspective view in use.

The portions shown in dashed lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for fuel heater, as shown and described. 